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At present, two species of Tyrannosaurus are considered valid; the type species, T. rex, and the earlier in age and more recently discovered T. mcraeensis. As the archetypal theropod, Tyrannosaurus has been one of the best-known dinosaurs since the early 20th century and has been featured in film, advertising, postal stamps, and many other media.
Montana's T. rex (also known as "Peck's rex", "Peckrex", "Rigby's rex" and Tyrannosaurus "imperator") is the nickname given to a fossil specimen found in Montana in 1997. [56] The discovery was made by Louis E. Tremblay on 4 July 1997 working under the supervision of J. Keith Rigby Jr. who led the excavation and bone preparation.
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Previously discovered T. rex skeletons were usually missing over half of their bones. [10] It was later determined that Sue was a record 90 percent complete by bulk, [11] and 73 percent complete counting the elements. [12] Of the 360 known T. rex bones, around 250 have been recovered. [1]
Like other T. rex fossils, Scotty shows signs of trichomoniasis, a parasitic infection in the jaw that left visible holes in the bone and was unique to this specific species of dinosaur. [ 13 ] [ 23 ] Additionally, a broken and healed rib on its right side, broken tail vertebra, as well as a hole near the eye socket are possibly the result of ...
However, there is no direct evidence T-Rex and Triceratops ever fought. Furthermore, a lot of Triceratops only had traces indicating scavenging. Yet healed injuries on either a T-Rex or Triceratops would be a clear sign of a fight. [18] A juvenile T-Rex has a bite force of 5,641 newtons compared to the 35,000 newtons of a full-grown adult.
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Stan Sacrison, an amateur paleontologist, was responsible for the initial discovery of Stan's bone fragments in 1987, and as a result is the namesake for the T. rex.He was out looking at plant life in South Dakota when he spotted Stan's pelvis visible in the side of a cliff. [3]
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